WEll intelectually and morally cloud your right.But in real life.This will never happen.There will always be wars and even after america isnt a super power.There will be wars fought for many reasons.There will be conflict.Countries will always argue and bicker.As far as i can see.We need to shut down our space programs due to the fact that we can barely get along with people of our own species.Yeah sure if some outside force comes and invades we will become one but thats only when we fend off the invasion.Once that happens i think more bull between our own kind will come.The UN was a lot bettter than the league of nations because the UN actually tries to enforced there treaties.But treaties are useless.